How many hours did it take Helen to drive from her house to her parent's house?

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How many hours did it take Helen to drive from her house to her parent's house?

(1) Helen's average speed on this trip was 72 kilometers per hour
(2) If Helen's average speed on this trip had been 8 kilometers per hour greater, it would have taken her 1 hour less.

Answer: C

Source: GMAT Prep
Source: — Data Sufficiency |